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Montana Field Guides

Olympia Marble - Euchloe olympia


Global Rank: G5
State Rank: S4

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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001] Forewing 1.7-2.0 cm. Antennae all white; wings white. Uppersurface with limited black on forewing tip (giving a diffuse grayish appearance), narrow black forewing bar in cell; undersurface with a rose flush along wing bases when fresh, no marbling on forewing, hindwing with yellow along veins and limited marbling (none on anal angle).

Phenology
One flight, mid-April to mid-May in Virginia; late April to early June in southern Ontario and Colorado (Scott 1986). Mainly April through June (Glassberg 2001). April through early July in the Rocky Mountain states (Ferris and Brown 1981). Probably late February to early July, one flight of 3-4 weeks at any particular locality (Clench and Opler 1983). Mid-April to mid-July in Colorado (Scott and Scott 1978; Clench and Opler 1983; Scott and Epstein 1987).

Diagnostic Characteristics
Determined by a combination of pure white antennae; uppersurface with little black (a narrow bar in forewing cell) and only a diffuse grayish appearance on forewing tip, undersurface with a rose flush along wing bases when fresh, no marbling on forewing, hindwing with yellow along veins and limited marbling (none on anal angle).

Species Range
Montana Range

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Range Comments
In southern Canada from Alberta to southwestern Quebec, south through the Great Plains east of the Rocky Mountains to central Texas, widespread in the Midwest with isolated population in the Appalachian Mountains (Clench and Opler 1983; Scott 1986; Opler and Wright 1999; Glassberg 2001); 1463 m to 2438 m elevation (always below 2743 m elevation) in Colorado (Brown 1957; Scott and Scott 1978, Clench and Opler 1983). In Montana, reported from at least 37 counties east of the continental divide (Kohler 1980; Stanford and Opler 1993; FLMNH Lepidopterists' Society database), to at least 2377 m elevation (Pryor Mountains in Carbon County). Uncommon in the west (Glassberg 2001).

Summary of Observations Submitted for Montana
Number of Observations: 5

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Non-migratory.

Habitat
Lower elevation dry open areas, prairie hills, foothills, badlands, chaparral, dunes, rocky ridges, shale and limestone barrens, open woodlands (Arnhold 1952; Ferris and Brown 1981; Clench and Opler 1983; Scott 1986; Opler and Wright 1999; Glassberg 2001). Habitat in Montana not described but probably similar; in the Great Yellowstone Ecosystem, reported from open woodland meadows, riverbanks, open hills (Debinski and Pritchard 2002).

Food Habits
Larval food plants include the mustards Arabis (several species), Descurainia, Lepidium, and Sisymbrium (Opler 1974; Ferris and Brown 1981; Clench and Opler 1983; Scott 1986, 1992, 2006). Adults feed on flower nectar, including Anaphalis, Arabis, Barbarea, Cerastium, Chorispora, Draba, Erysimum, Lathyrus, Lepidium, Lesquerella, Linum, Mertensia, Penstemon, Phlox, Physaria, Sedum, Thlaspi, and Viola (Clench and Opler 1983; Scott 1992, 2006, 2014).

Reproductive Characteristics
Females lay eggs singly on host plant leaflets and flower buds. Larvae feed on host flowers, fruits, and leaves when young, host plant leaves and stems when older, build no nests, hibernate as pupae, presumably after developing to L5 instar as with other Euchloe, usually pupate on stalk of host plant, sometimes non-host plant such as Andropogon (Arnhold 1952; Opler 1974; Scott 1979, 1986, 1992, 2006; Clench and Opler 1983; James and Nunnallee 2011). Males patrol throughout the day on hilltops and slopes of ridges in search of females (Arnhold 1952; Scott 1975b, 1986).

References
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Citation for data on this website:
Olympia Marble — Euchloe olympia.  Montana Field Guide.  .  Retrieved on , from